As an action you can point to an area up to 10 feet away and flames appear, rising from them is the demons you summon:

At 1st level you can summon 1d4 imps

At 5th level you can summon 1d4 hell hounds

At 8th level you can summon 2 Succubus

At 11th level you can summon 2 Barbed Devils

You can use this ability equal to your charisma modifier. You regain the uses of this ability at the end of a long rest. 

Your Intelligence score increases by 1, and your Charisma score increases by 2.

Thanks to your infernal heritage, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You have resistance to fire damage.

You know the friends cantrip. When you reach 3rd level, you can cast the hellish rebuke spell as a 2nd-level spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the darkness spell once with this trait and regain the ability to do so when you finish a long rest. Charisma is your spellcasting ability for these spells.

You can speak, read, and write Common and Infernal.